drop with a specific shape into a quiet liquid water surface with mantaflow
I was also trying to do something like the video. I was able to do it on blender 2.8 but not with mantacore.
After some tries I was able to get something similar (materials pending). The following images are from blender 2.90.1. If anything else needed let me know.
Water:

Ball (crosses the water object in 10 frames and has the scale of 1/3 of the water object)

CollisionBox part 1:

CollisionBox part 2:

The final result on frame 30: